JavaScript Screen Object JavaScript Navigator Object

Navigator onLine Property

onLineA read-only property returns a boolean value indicating whether the browser is in online or offline mode.

If the browser is online, this property returnstrue, otherwise returnsfalse.

Syntax:

navigator.onLine

Example

var x = navigator.onLine;
document.querySelector("#output").innerHTML = x;

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Browser compatibility

The numbers in the table specify the first browser version that fully supports the onLine property:

Property
onLine	14	3.5	Yes	5.1	Yes

Technical details

Return value:	Boolean value, returns true if the browser is online, otherwise returns false

More examples

This example displays all Navigator properties:

Example

var txt = "";
txt　+= "<p>Browser CodeName: "　+　navigator.appCodeName　+　"</p>";
txt　+= "<p>Browser Name: "　+　navigator.appName　+　"</p>";
txt　+= "<p>Browser Version: "　+　navigator.appVersion　+　"</p>";
txt　+= "<p>Cookies Enabled: "　+　navigator.cookieEnabled　+　"</p>";
txt　+= "<p>Browser Language: "　+　navigator.language　+　"</p>";
txt　+= "<p>Browser Online: "　+　navigator.onLine　+　"</p>";
txt　+= "<p>Platform: "　+　navigator.platform　+　"</p>";
txt　+= "<p>User-agent header: "　+　navigator.userAgent　+　"</p>";
document.write(txt);

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Related References

Navigator Reference:navigator.appCodeName property

Navigator Reference:navigator.appname property

Navigator Reference:navigator.cookieEnabled property

Navigator Reference:navigator.language property

Navigator Reference:navigator.platform property

Navigator Reference:navigator.userAgent property

JavaScript Navigator Object